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25 pair termination
#456692 10/07/11 08:23 AM
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We have 2 building split by a small driveway. We have phone lines brought in and terminated with phone system in building A. We have a 66 block with 25 pair terminated in building A going underground to building b where it is terminated again to a 66 block.

Station lines already run terminated to 66 block and cross connect wires to 25 pair block.

Plug in station phones and nothing. They are dead.

So to troubleshoot I terminated a jack with pair 3/4 terminated back to building A. Punched down on block tested and phone turns up.

Went back to building B, terminated to 25 pair 66 block and nothing. So I pull one pair off and terminate the jack directly to the 25 pair. Plug in phone and voila, station turns up.

Why is it that one I terminate the 25 pair to 66 block and then terminate the cross connect going to the station blocks I get nothing.

Has me baffled. 25 pair is good coming into building B.

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Re: 25 pair termination
#456693 10/07/11 08:33 AM
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Are any of these blocks protected? I'm wondering if the clamping voltage of a protective device might be too low for the system's voltage.


Ed Vaughn, MBSWWYPBX
Re: 25 pair termination
#456694 10/07/11 08:39 AM
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Is the block labeled 66M50? You probably need bridging clips.


Arthur P. Bloom
"30 years of faithful service...15 years on hold"

Re: 25 pair termination
#456695 10/07/11 08:46 AM
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A toner and a amp wand would have been my first choice to use in troubleshooting..


Forty six years and still fascinated with Telecommunications!
Re: 25 pair termination
#456696 10/07/11 09:45 AM
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Why? He isn't trying to trace anything. He's looking for an open circuit. He knows where the (only) cable starts and ends. He knows what pairs he used. (unless he cut them down wrong.) He hears dial tone at the raw wires. He just doesn't hear DT at the other side of the block, where the X-conns are cut down.

OK, I'll spell it out:

A test set (butt set) would be my first choice. Go the side of the 66M block where the incoming cable terminates. Is it a 66M25, 66M50, some other type? Do you hear dial tone? Put the clips exactly opposite the wires on the same block. Dial tone? No? You need bridging clips.


Arthur P. Bloom
"30 years of faithful service...15 years on hold"

Re: 25 pair termination
#456697 10/07/11 12:45 PM
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Bridge clips have been used with no success.

I'm not sure I know what you mean be protected. It's just the standard white 66 block with the back mount. Nothing else.

The raw pair terminated to a jack does bring up the phone and has dial tone. Raw pair terminated to the 66 block, cross connect cable terminate to opposite to wall jack we get nothing. I've added bridge clips which are required and still nothing.

As the first responder referenced, I'm wondering if it is a voltage thing. But i've never seen this before and I've done a lot of cabling. Much more than programming that's for sure.

Re: 25 pair termination
#456698 10/07/11 12:52 PM
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Around here, a lot of house cable is terminated on terminals that have the pins on the block going horizontal instead of vertical. On a normal 66 block, pair one would be tip on pin one and ring on pin two. with these, tip is to the left of the ring pin, so if you punched your jumper down like normal you would be splitting pairs. Sorry, I don't know the technical term of these horizontal type punch down blocks.

Re: 25 pair termination
#456699 10/07/11 01:28 PM
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I've seen the different ways you are referring to and I'm using what I think is standard horizontal method for newer cabling. I believe the terminating across vertically was used as an older standard.

Re: 25 pair termination
#456700 10/07/11 01:35 PM
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Take a jack with a short piece of jumper wire on it, and terminate it to the right side of the block, put in your bridge clips, does the phone work in that jack?

If so, make sure you're on the correct I/W, and the pair that you are jumpering to is the same pair terminated on the jack on the wall.

Re: 25 pair termination
#456701 10/07/11 02:01 PM
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Is the block mounted on a piece of wood? Or is it mounted direct to concrete or block? If it's the second you're block is probably corroded. If it's on wood do as TTT says to isolate where your trouble is.

Is this new? Existing? Ever worked?


Retired phone dude
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